package com.itheima.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.reggie.common.BaseContext;
import com.itheima.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

//过滤器
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {
    //路径通配符设置
    public static final AntPathMatcher PATH_MATCHER= new AntPathMatcher();

    /**
     *
     * @param servletRequest
     * @param servletResponse
     * @param filterChain
     * @throws IOException
     * @throws ServletException
     */
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {

        HttpServletRequest request= (HttpServletRequest) servletRequest;
        HttpServletResponse response= (HttpServletResponse) servletResponse;
        //1.获取本次请求的路径
        String requestURI = request.getRequestURI();
        log.info("拦截到请求:{}",requestURI);
        //2.处理不需要处理的请求路径
        String[]  urls=new String[]{
                "/employee/login",
                "/employ/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",
                "/user/login"
        };
        //3.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //4.不需要处理直接放行
        if (check){
            log.info("本次请求不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }
        //5.判断登陆状态,登陆放行
        if (request.getSession().getAttribute("employee")!=null){
            log.info("用户已经登录,id为:{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request,response);
            return;
        }

        //4-2、判断登录状态，如果已登录，则直接放行
        if(request.getSession().getAttribute("user") != null){
            log.info("用户已登录，用户id为：{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request,response);
            return;
        }
        //6.未登录返回未登录结果,并通过输出流方式向客户端响应数据
            log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;

    }
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean result = PATH_MATCHER.match(url, requestURI);
            if (result){
                return true;
            }
        }
        return false;
    }

}
